How did other nations feel at first about Hay’s idea of an Open Door Policy? Why did they change their minds?

Open Door policy, statement of principles initiated by the United States in 1899 and 1900 for the protection of equal privileges among countries trading with China and in support of Chinese territorial and administrative integrity. The statement was issued in the form of circular notes dispatched by U.S. Secretary of State John Hay to Great Britain, Germany, France, Italy, Japan, and Russia. The Open Door policy was received with almost universal approval in the United States, and for more than 40 years it was a cornerstone of American foreign policy in East Asia.

Explanation:

it's not the readmission

explanation:

japan participated in world war i from 1914 to 1918 in an alliance with entente powers and played an important role in securing the sea lanes in the west pacific and indian oceans against the imperial german navy as the member of the allies.